Freshwater · Spring through fall best; March to October in desert canyon rivers
Roundtail Chub
Gila robusta
A streamlined, fork-tailed native minnow of the Colorado River basin that behaves more like a trout than a chub, holding in canyon pools and rising to flies and small lures. It is under conservation pressure from nonnative predators and altered flows, and Arizona manages it as a sport fish in places — check local rules and release native fish carefully.
Seasons · Peak
Identifying features
- Streamlined, torpedo-shaped body built for current
- Large, deeply forked tail — the 'roundtail' profile in the water
- Small, fine scales giving a smooth, almost scaleless look
- Olive-grey back fading to silvery-white below
- Breeding males develop orange-red fin bases and tubercles on the head
Habits
- Native only to the Colorado River basin of the desert Southwest
- Holds in the deepest pools of canyon rivers, like a trout
- Omnivorous — eats insects, crayfish, small fish, algae and seeds
- Spawns in late spring and early summer over gravel in pools and runs
- Declining from nonnative predators and water development; handle gently
Distribution
Where to find them
- Verde River canyon pools in Arizona
- Gila and Salt River pools and runs
- Colorado and Green River canyon pools in Utah and Colorado
Where they live
How to catch them
Trout-style fishing in canyon pools River
Rig: Light spinning or fly tackle with small lures, flies or bait drifted through canyon pools and runs, where the fish holds like a trout
Bait/lure: Small flies, worms, grasshoppers
Key tip: Fish the deep green pools at dawn and dusk, and release native chubs quickly in the water where rules or conservation call for it.
Casting small spinners in river pools River
Rig: Ultralight to light spinning rod, small inline spinners cast across Verde, Gila and Salt River pools and retrieved through the current seams
Bait/lure: Small inline spinners, tiny spoons
Key tip: Work the seam between fast and slow water — roundtails ambush food from the edge of the current.
Best baits & lures
Baseline setup
- Rod: Light 6-7 ft spinning rod or 4-5 wt fly rod
- Line: 4-8 lb mono or fluorocarbon
- Terminal: Small spinners, spoons, flies, size 6-10 hooks
Recommended gear for this species
Rod · Best value
9' 5-weight fly rod outfit
≈ US$180-260
Covers chironomid lakes and small rivers with one setup.
Flies · Budget
Chironomid assortment (30 patterns)
≈ US$25-40
Chironomids are 60% of a lake rainbow's diet in spring.
Picks come from our rule library — never paid placements. Prices are guides; affiliate links may earn us a commission.
Typical size
Common 10-14 in (25-36 cm); large fish to about 20 in (51 cm)
On the table
Poor to fair — bony minnow flesh, and as a native fish under conservation pressure it is best released.
Similar species
Utah ChubUtah chub is a smaller, deep-bodied lake and slow-water fish with a less forked tail; roundtail chub is a larger, streamlined river fish with a big forked tail
Arroyo ChubArroyo chub is a small, thick-bodied California stream fish under about 5 in; roundtail chub is a much larger Colorado-basin river fishRegulations vary by area and can change in-season — always check the official rules for your area before you fish. Regulations guide →
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